Drug interactions
Chlorzoxazone + Fentanyl transmucosal
Severity: Major
Chlorzoxazone and Fentanyl transmucosal: major interaction.
Last updated
For healthcare professionals — reference only. This page is a brief summary, not medical advice and not a substitute for official labeling or clinical judgement. Always verify before prescribing or dispensing.
Summary
Transmucosal fentanyl is potent and fast acting, and combination with a muscle relaxant raises the risk of profound sedation and respiratory depression.
What this interaction means in plain words
Chlorzoxazone and Fentanyl transmucosal can interact in a way that may be serious. Using them together is sometimes necessary, but it needs a deliberate decision by the prescriber, a plan for monitoring, and clear advice on the warning signs to watch for.
Why it happens
Additive CNS and respiratory depression through pharmacodynamic synergism.
What to do
Reserve for patients without alternatives, use the lowest doses, and monitor closely for respiratory depression and sedation.
What to ask your pharmacist
- Does the benefit of taking both outweigh the risk in my case?
- Do I need any blood test, ECG or other check while on both?
- What early warning signs should I watch for, and what should I do if they appear?
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Other interactions of Chlorzoxazone
Frequently asked questions
Can I take Chlorzoxazone with Fentanyl transmucosal?
MediHelp rates the interaction as major. Chlorzoxazone and Fentanyl transmucosal can interact in a way that may be serious. Using them together is sometimes necessary, but it needs a deliberate decision by the prescriber, a plan for monitoring, and clear advice on the warning signs to watch for. Transmucosal fentanyl is potent and fast acting, and combination with a muscle relaxant raises the risk of profound sedation and respiratory depression.
How serious is the interaction between Chlorzoxazone and Fentanyl transmucosal?
MediHelp rates it major, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Reserve for patients without alternatives, use the lowest doses, and monitor closely for respiratory depression and sedation.
What other medicines interact with Chlorzoxazone?
MediHelp also lists interactions of Chlorzoxazone with, for example, Alfentanil, Alprazolam, Amobarbital. The full list is on the Chlorzoxazone page.
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